Simultaneous multi-voltage rail voltage regulation messages

A method at a voltage regulator (VR), the method including:

• providing a plurality of supply voltages to an integrated circuit (IC) coupled to the VR, including:
• providing a first supply voltage at a first supply voltage level;
• and
• providing a second supply voltage at a second supply voltage level;
• exchanging with the IC a voltage regulation message which identifies two or more supply voltages of the plurality of supply voltages, wherein the voltage regulation message further indicates a desired regulation of each of the two or more supply voltages;
• and
• based on the exchanged voltage regulation message, concurrently transitioning the first supply voltage away from the first voltage level and transitioning the second supply voltage away from the second voltage level.

An apparatus including:

• an integrated circuit (IC) to couple to a voltage regulator (VR), the IC to receive a plurality of supply voltages from the VR, including the IC to receive:
• a first supply voltage at a first supply voltage level;
• and
• a second supply voltage at a second supply voltage level;
• the IC further to exchange with the VR a voltage regulation message which identifies two or more supply voltages of the plurality of supply voltages, wherein the voltage regulation message further indicates a desired regulation of each of the two or more supply voltages, wherein, based on the exchanged voltage regulation message, the VR concurrently transitions the first supply voltage away from the first voltage level and transitions the second supply voltage away from the second voltage level.

A method at an integrated circuit (IC), the method including:

• receiving a plurality of supply voltages from a voltage regulator (VR) coupled to the IC, including receiving:
• a first supply voltage at a first supply voltage level;
• and
• a second supply voltage at a second supply voltage level;
• exchanging with the VR a voltage regulation message which identifies two or more supply voltages of the plurality of supply voltages, wherein the voltage regulation message further indicates a desired regulation of each of the two or more supply voltages, wherein, based on the exchanged voltage regulation message, the VR concurrently transitions the first supply voltage away from the first voltage level and transitions the second supply voltage away from the second voltage level.